Sound-box



G. A. MOORE.

SOUND BOX. APPLICATION FILED SEPT- 23, l919- RENEWED SEPT. 25, 1920.,389,683.

Patented Sept. 6, 1921 Inven lo a", George ilMoore; 2.3

CLZZBrne UNITED STATES PATENT OFFICE.

GEORGE'A. moon, or mnnronn, MASSACHUSETTS. Y

Application filed September 23, .1919, Serial No. 326,419. RenewedSeptember 25, 1920. Serial No. 412,893.

To all whom it may concern Be it known that'I, GEORGE 'A. MOORE, acitizen of the United States, and-a resident of Medford, in the countyof Middlesex and Commonwealth of Massachusetts, have invented certainnew and usefulImprovements in Sound-Boxes, of which the following is afull, clear, and exact specification. 7

This invention has for its object the construction of improved means forpivotally supporting the needle armof a talking machine sound box.

To this end, I clamp the needle arm to a diaphragm supported'at rightangles to the plane of the resonator diaphragm, and-provide meanswhereby the clamping means can be shifted in the plane of its diaphragmin order that the point of the needle arms attachment to the resonatordiaphragm may be entirely neutral thereto, in other words, that it mayhave no tension thereon in either direction.

In the drawings forming part of this specification, Figure 1 is a faceview of a sound box embodying my improvements. Fig. 2 is a view of thesame looking in the line of its stylus. Fig. 3 is a central sectionalview of the same. Fig. 4: is a view similar to that in Fig. 2 but withcertain parts removed. Fig. 5 is a perspectiveview of a portion of theneedle arm and its supporting diaphragm. Fig.6 is a perspective view' ofthe threaded annulus composing a part of the clampingfmeans for thesupporting diaphragm.- Fig. 7 is a sectional view of the same, Fig. ,8is a sectional view of the other member of=the clamping means. Fig. 9 isa view ofone of the cross arms between which the supporting diaphragm isfastened. Fig. 10 is an edge view of the supporting "diaphragm showingthe cross arms of the needle arm attached thereto. Fig. 11 is a faceviewof the back plate of the sound box. 1 I I The sound box casecomprises an annular member 1 and a back plate 2 suitably attachedthereto, as by screws 3, the back plate'having a socket portion 4 forconnection with-the tone arm of the talking machin in a well knownmanner.

Rigid with the annular member 1 and preferably integral therewith, is'aplate 5 Specification of Letters Patent.

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as shown in Figs. 3 and 1. This plate has an opening 6 through it forthe free passage of the needle arm section 7, and also two slots 9 nearits extremities.

The needle arm is in two sections 7 and 10, the section 10 containingthe socket for the stylus 11, while the section 7 is attached to theresonator diaphragm in a well known way. The cross arm 12, as shown inFigs. 5 and 9 is provided withan ofiset lug 13 rigidly connected withthe needle arm section 7. These cross arms 12 and 14 have their centerlines located in the same plane with the diaphragm 15and are attached tothe opposite surfaces 'ofthe supporting diaphragm 16, preferably byrivets 17. The surface of each cross arm in contact with the diaphragm16 is narrowed down to substantially the diameter of the rivets 17, asshown in Figs. 9 and 10, and its ends are further narrowed to points, asshown in Fig. 9.

For supporting the diaphragm 16, an externally threaded ring 20 isprovided, and an internally threaded ring 21, the latter beingconstructed to be screwed on over the former. Each ring is provided withan annular lip 22 constructed to clamp the diaphragm 16 between themwhen the rings are screwed together. The ring 20 is formed with adiametrical 'recess, 23 of a width to snugly receive the plate 5, and isattached thereto by screws 24: passing through the slots 9 into thering. Small pins 25 projecting from the ring 20 into holes 28 in thediaphragm 16 serve to keep the latter accurately in place formaintaining the parallelism between .the cross arms 12, 14 and thediaphragm 15.

In the manufacture of this sound box, the outer surface of the plate 5is made exactly at right angles to the plane of the annulus 1. Theneedle arm sections 7,10 are attached to the diaphragm 16, and thelatter clamped between the lips of the rings 20, 21. Thenthe attachingend 27 of the arm section 7 is accurately ground to lie at right anglesto the diaphragm 16, or, at least, to the inner surface of the recess23; Now, the needle section 7 having been introduced through the opening6, and the recess 23 pressed into engagement with the plate 5, the rings20, 21 are slid up or down therecate, will be transmitted to theresonator diaphragm.

' 15, so that there can be no vibration of the The narrowing of thecontact surfacesof the cross arms 12, 14, as shown in Fig, 9, is for thepurpose of increasing the pivotal sensitiveness of the needle arm. Itis, of course, necessary to have the cross arms of suflicient'width notto be weakened by the rivet holes, but by narrowing the contact facesand Widening the remainder of the cross arms, the desired narrownessobtamed wlthoutdimlnlshmg the strength;

This narrowness is further extended at points extending beyond therivets, as shown in Fig. 9, for the purpose of dlminishlng thepossibility of any vibration or yieldingly later ally in the same planewith the diaphragm 5 needle arm except in a plane at right angles tothis diaphragm, thusfurther increasing the perfection of tonecommunicated to the sound box. a

As shown in Figs. Sand 11, I prefer to have the back plate 2 largeenough in diameter to reach nearly to the extreme periphery of theannulus 1 and to form it with a notch 26 fitting the plate 5. Thiscoactionof the notch 26 and plate 5 renders the act of positioning theback platein the annulus much easier and quicker than it wouldotherwisebe, inasmuch assoon as the back plate has had its notch engage the plate5 and is intro duced within its seat in the annulus, the

screw holes for the screws 3 will be fo accurately alined "and thescrews can be inserted immediately. What I claim is:

'1. A sound box comprising a case, a resonatordiaphragm supported bysaid case,

o resonator diaphragm supported thereby, a

a pivotal diaphragm supported substantially at right angles tothe planeof the resonator diaphragm and with its center in the plane of the same,and a needle arm supported by the pivotal diaphragm and attached to theresonator diaphrag v 2. A sound box comprlslng an annulus, a

7 plate rigid, with the annulus and projecting at right angles to theplane of the diaphragm and in opposite directions from the annulus, apivotalfdiaphragm, an annular member supporting the pivotal diaphragmand slidable on said plate, means adjustably binding the annular memberto said plate,

and a needle arm supported by the pivotal.

diaphragm and attached to the resonator diaphragm, said plate having anopening phragm in opposite directions from the an-' nulus, a pivotaldiaphragm, an annular member supporting the pivotal diaphragm andslidable on said plate, said plate having slots through it, screwspassing through said slots into engagement with said member, and aneedle arm supported by the pivotal diaphragm and attached to theresonator diaphragm. a r

"4:. A'sound box comprising an annulus, a resonatordiaphragm supportedthereby, a plate rigid with the annulus and projecting at right anglesto the plane *of the diaphragm, a pair of rings supported by said plate,one having aninternally threaded portion and the other a threadedperiphery screwing intosaid portion, a pivotal diaphragm clamped betweenthe ringsyand a needle arm supported by the pivotal diaphragm' andattached'to the IESOIliLtOlIllitphragm. V I

5. A sound box comprising a" resonator diaphragm, a pivotal diaphragm,two rings clamping the'edges of the latter between them, meansmovably'supporting said rings, and a needle arm attached at one end tothe resonator-diaphragm and supported at an intermediate point by thepivotal diaphragm.

6. A'sound box comprising an annulus, aresonator diaphragm supportedthereby, a plate rigid with the annulus and'extending at righ angles tothe plane of the diaphragm, an externally threaded ring supported bysaid plate, an internally threaded ring'coacting with the former ring, apivotal diaphragm clamped'between the two rings, means attaching theexternally threaded ring to said platefand a needle arin'supported bythe pivotal diaphragm and attached to theresonator diaphragm.

7 A sound box comprising'an annulus, a resonator diaphragm supportedthereby, a parallel-sided plate held by"theannulus at right angles tosaid diaphragm and having a longitudinally extended slot near each end,an externally threadedring slidably fitting said' 'pla' te, screwspassing through said slots into engagement with said ring, an internallythreaded ring coa'cting with the former ring, a pivotal diaphragmclamped between saidrings, and a" needle arm supported by saidpivotal'diaphragm and attached to said resonator diaphragm. 8. A' soundbox comprising an annulus, a resonator diaphragm supported thereby, anexternally threaded ring, an internally threadedring coacting withth'former ring and-opposing the first-named ring, a pivotal diaphragmclamped between said rings, means connecting said rings and annulus, anda needlearm supported by the pivotal diaphragm and attached to theresonator diaphragm.

9. A sound box comprising a resonator diaphragm, a pivotal diaphragmsupported near its edges at right angles to the plane of the resonatordiaphragm, with its center in the plane of the latter, and a needle armattached to the resonator diaphragm and to the pivotal diaphragm, theneedle arm being formed with an offset for enabling it to avoid contactwith the box and to present the needlein substantially the same planewith the resonator diaphragm.

10. A sound box comprising a resonator diaphragm, a pivotal diaphragm,means supporting the pivotal diaphragm, two narrow extended cross armsclamping the pivotal diaphragm between them with their center at thecenter of the latter diaphragm and lying in a plane parallel with theresonator diaphragm, and a needle arm attached at one end to the latterdiaphragm, and intermediately supported by said cross arms.

11. A sound box comprising an annulus, a resonator diaphragm supportedthereby, a pivotal diaphragm, means supporting the latter near its edgesconnected with said annulus, a needle arm terminally connected with theresonator diaphragm and having a transversely disposed cross arm, asecond cross arm adapted to carry the stylus, and means clamping saidcross arms tightly together with the pivotal diaphragm between, thesurfaces of the cross arms in contact with the pivotal diaphragm beingquite narrow in comparison with the portions of the pivotal diaphragmbeside them.

12. A sound box comprising an annulus, a resonator diaphragm supportedthereby, a plate held by said annulus at right angles to the diaphragmhaving an opening through it, a pivotal diaphragm supported by saidplate substantially parallel with it but spaced therefrom, and a needlearm in two sections each having a cross arm, means clamping the crossarms together at opposite surfaces of the pivotal plate, one of thesections having a socket for the reception of the stylus, the othersection being attached to the resonator diaphragm, and passing throughsaid opening, one of said cross arms having a projection therefromsubstantially parallel with the pivotal diaphragm but spaced therefromand connecting this cross arm with the last-mentioned needle armsection. 7

13. A sound box comprising a resonator diaphragm, a pivotal diaphragm, aneedle arm attached to the resonator diaphragm, united means supportingsaid diaphragrns, and means attaching said needle arm to the pivotaldiaphragm consisting of two cross arms lying in the same plane with theresonator diaphragm with the pivotal diaphragm, between, and rivets orthe like passing through said cross arms'and clamping them and thelatter diaphragm tightly together, the surface of each cross armcontacting with the pivotal diaphragm being narrowed to substantiallythe diameter of said rivets.

14:. A sound box comprising a resonator diaphragm, a pivotal diaphragm,united means supporting said diaphragms at right angles to each other,the center of the pivotal diaphragm being in the same plane with theresonator diaphragm, a needle arm attached to the resonator diaphragmand supported by the pivotal diaphragm, and a stylus carried by theneedle arm with its axis in the same plane with the resonator diaphragm.

In testimony that I claim the foregoing invention, I have hereunto setmy hand this 15th day of September, 1919.

GEORGE A. MOORE.

